Mark 9:1-2
(Mar  9:1)  And he said to them, "Truly, I say to you, there are some  standing here who will not taste death until they see the kingdom of God  after it has come with power."
There  are two things I’d like to point out about these two verses, and they  illustrate some ways in which we can look at scripture and study the  details.
Firstly,  is the kingdom of God and the placing of its coming within history.   The potential nature of the kingdom is revealed a little, but for the  moment we will keep the nature simple and deal with it as “the rule of  Christ on earth”.  There are two popular interpretations as to what  Jesus is speaking of here.  Obviously he is considering the coming to  occur within the lifetime of some of his disciples, so the popular  interpretations fall within this time frame, i.e. within about 50 years  of Jesus speaking these words.  Some believe he was referring to his  victory over sin and the devil on the cross and the completion of all  that was required by the Father for him to make eternal life possible,  including the going forth of the gospel in the Spirit via the disciples  (after Jesus ascension).  Others believe Jesus to be talking about his  transfiguration before three of the disciples which took place in the  next passage, with the physical radiance of his glory as the taste of  the coming of the kingdom.  Note that Jesus doesn’t speak of the arrival  of the kingdom, just its coming, as if it may take place over a period  of time.  Along with the restricted time frame, that is why these two  ideas are considered the best possible interpretations.
I  think that the best interpretation is that of the victory on the cross  and following spread of the gospel.  I’ll offer two reasons, keeping it  brief:
1.  I think that the more evident work of power, visible to those who have  eyes to see, is the victory on the cross and the spread of the gospel.
2.  Jesus gives a range of 50 years for the fulfillment which would be  strange if the fulfillment was to take place next week (within 6 days  according to verse two).
However,  to counter my own argument, and to demonstrate an open mind (because  after all, it does not matter overly much to us 2000 years after the  events), it is possible that the 6 days specifically spoken of is some  sort of literary device used to ‘hold one’s breath’ while we wait for  the immanent fulfillment.  My reasoning here gives me enough of a hint  of doubt to not stake my life on this, but even though we are left  feeling unsure about the interpretation, the process of thinking through  this has been very beneficial.
At  the start I said there were two things I’d like to point out.  The  second is the issue of the six days in verse two.  Throughout Mark so  far, Jesus has been doing things in a rush it seems.  Mark continually  shows Jesus to be a man of action as he is always “immediately” doing  something.  Have a quick flick back through Mark and see how many times  you can see Mark use words referring to Jesus quickly moving onto the  next thing.  My question is this: Why does Mark all of a sudden change  his pace and take six days in his narrative?  It seems that whenever  anything like this occurs within scripture, the writers are trying to  draw our attention to something in that section of scripture.  I’m not  sure what that something is just yet.  Maybe it is the transfiguration  immediately after this pause.  Maybe it is meant to increase the readers  feeling of gravity over the cost of discipleship immediately before.   Maybe it’s both.  I’ll ponder it some more...